168489193 has 16 divisors (see below), whose sum is σ = 181653840. Its totient is φ = 155713536.

The previous prime is 168489143. The next prime is 168489203. The reversal of 168489193 is 391984861.

It can be written as a sum of positive squares in 8 ways, for example, as 6487209 + 162001984 = 2547^2 + 12728^2 .

It is a cyclic number.

It is not a de Polignac number, because 168489193 - 2⁹ = 168488681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168489143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291721 + ... + 292297.

It is an arithmetic number, because the mean of its divisors is an integer number (11353365).

Almost surely, 2^168489193 is an apocalyptic number.

It is an amenable number.

168489193 is a deficient number, since it is larger than the sum of its proper divisors (13164647).

168489193 is a wasteful number, since it uses less digits than its factorization.

168489193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

The product of its digits is 373248, while the sum is 49.

The square root of 168489193 is about 12980.3387089860. The cubic root of 168489193 is about 552.3198902423.

The spelling of 168489193 in words is "one hundred sixty-eight million, four hundred eighty-nine thousand, one hundred ninety-three".